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SIR(SURFACEINSULATIONRESISTANCE)testingisamethodologyusedtoevaluateelectronicassemblymaterialsandprocessesasonemeasureofreliability.ThegoalofSIRtestingistocatchdangerouspropensitiesforelectrochemicalfailuremechanisms,suchasunacceptableelectricalleakageunderhumidconditions,corrosionormetalmigration,beforetheycanoccuronproducedassemblies. usinganassembledcoupon. ReferStandard: IEC61189-5 ISO9455-17 IPC-TM-650 BELLCOREGR-78-COREJISSTANDARDS ◇InsulatingresistancemethodMeasuringsuperinsulationresistanceinvolvesmeasuringelectricalcurrentinordersofpAtonA.However,useofarelaytypescannerforthispurposewillleadtoaconductivefailureorintermittentmeasurement.TheMIGseriesemployinsulatingresistancemethodenablingcontinuousandhighlyaccuratemeasurement.◇ AccuratereproductionandmeasurementoftheionmigrationphenomenonThevirtualgroundcircuitmethodusingasimplecoaxialcableisnotsuitablefortheionmigrationtestsinceitinvolveshighlevelsofinductednoisesandhumming.TheMIGseriesfiltersbothofthembywayofaninsulationresistancecircuitusingadual-shieldactiveguardcable.Inaddition,thevoltageapplyingpartconsistsofacircuittolimittheelectriccurrent,acircuittoemptyallstoredenergyandactiveguardcable,therebypreventinganydendritesfrombeingscattered.◇ systemself-checkThebiascircuit,A/DandI/Vconvertersincorporateself-checkingsystemandawarningisissuedimmediatelyintheeventofanyerror.